Failed when execute ghcjs-boot

[Rizary]

I got the following error when try to execute ghcjs-boot with the option mentioned in here ghcjs/ghcjs#487

I'm using cabal HEAD version and ghc 8.0.2 downloaded from haskell web. I tried to build ghc using guide in here https://github.com/leksah/leksah.

thing that i noted is that the ghc-pkg still notice my Cabal-1.24.2.0 as mentioned in the third line on the below code.

ghcjs-intree
includes
/Users/Rizitecs$ [ghc-pkg]: /usr/local/bin/ghc-pkg "list" "--simple-output"
/Users/Rizitecs$ [ghc-pkg]: /usr/local/bin/ghc-pkg "dump"
/Users/Rizitecs$ [ghc-pkg]: /usr/local/bin/ghc-pkg "field" "Cabal-1.24.2.0" "abi"
/Users/Rizitecs$ writing /Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs/package.conf.d/Cabal-1.24.2.0.conf
/Users/Rizitecs$ [ghcjs-pkg]: /Users/Rizitecs/.cabal/bin/ghcjs-pkg "recache" "--global" "--no-user-package-db"
installing stage 0
/Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs/ghcjs-boot/boot/ghc-prim$ rm_rf dist
/Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs/ghcjs-boot$ [cabal]: /usr/local/bin/cabal "--config-file" "/Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs/cabalBootConfig" "--ignore-sandbox" "install" "./boot/ghc-prim" "--solver=topdown" "--global" "--ghcjs" "--one-shot" "--avoid-reinstalls" "--builddir" "dist" "--with-compiler" "/Users/Rizitecs/.cabal/bin/ghcjs" "--with-hc-pkg" "/Users/Rizitecs/.cabal/bin/ghcjs-pkg" "--prefix" "/Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs" "--enable-documentation" "--haddock-html" "--haddock-hyperlink-source" "--enable-shared" "--enable-library-profiling" "-v2" "--dry-run"
/usr/local/bin/cabal --config-file /Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs/cabalBootConfig --ignore-sandbox install ./boot/ghc-prim --solver=topdown --global --ghcjs --one-shot --avoid-reinstalls --builddir dist --with-compiler /Users/Rizitecs/.cabal/bin/ghcjs --with-hc-pkg /Users/Rizitecs/.cabal/bin/ghcjs-pkg --prefix /Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs --enable-documentation --haddock-html --haddock-hyperlink-source --enable-shared --enable-library-profiling -v2 --dry-run
solver must be one of: modular
CallStack (from HasCallStack):
  error, called at ./Distribution/ReadE.hs:46:24 in Cabal-2.1.0.0-inplace:Distribution.ReadE
ghcjs-boot: error running: /usr/local/bin/cabal --config-file /Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs/cabalBootConfig --ignore-sandbox install ./boot/ghc-prim --solver=topdown --global --ghcjs --one-shot --avoid-reinstalls --builddir dist --with-compiler /Users/Rizitecs/.cabal/bin/ghcjs --with-hc-pkg /Users/Rizitecs/.cabal/bin/ghcjs-pkg --prefix /Users/Rizitecs/.ghcjs/x86_64-darwin-0.2.1-8.0.2/ghcjs --enable-documentation --haddock-html --haddock-hyperlink-source --enable-shared --enable-library-profiling -v2 --dry-run
exit status: 1
stderr: solver must be one of: modular
CallStack (from HasCallStack):
  error, called at ./Distribution/ReadE.hs:46:24 in Cabal-2.1.0.0-inplace:Distribution.ReadE

[ezyang]

Dupe of #3987, which was fixed Cabal side, but the ghcjs build system has to be adjusted to take advantage of the new flag.

[b-mehta]

I'm still getting this issue, has this been fixed?

[grayjay]

It looks like there is a PR to update GHCJS, but it hasn't been merged: ghcjs/ghcjs#624

[Rizary]

@b-mehta @grayjay did you use Cabal in master branch?

[grayjay]

@Rizary I'm not sure I understand. The cabal master branch has a flag (added in #4227) that ghcjs-boot could use to reinstall boot libraries without passing --solver=topdown to cabal. --solver=topdown causes an error in newer versions of cabal.